?? ??:????????????????,??????????
????:1?????:????????????
2?????vx
3???????????
4????????????
5????????
???????????12???2?????????? (?? ?????? ??)??????????12???2??????
?????????????:???,?????????????????,???,?«????????»???????????,?3?????“????????”?????????????????,???????????????
????????:?,??,?????????????????
????????????????,?????,???????????????????????????????????,????????,???(??????) ???:?????????